[automerger skipped] [Status bar] Define flag for migrating to TelephonyDisplayInfo.isRoaming() am: f2704c11fd am: 3f4bdbe14d -s ours

am skip reason: Merged-In Ifbbd7eee1bea8aab4c4836f126e59876c2df854c with SHA-1 aa82bb9da3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25439373

Change-Id: I5e4d6a11d408edb7fbd92fcbf667cc5c7c40ae9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>